EASY
Earn 100

Match Column- I with Column - II and select the CORRECT option from the codes given below
 
  Column I   Column II
(1) A single trait controlled by three or more than three alleles (i) Pleiotropy
(2) A single trait controlled by three or more than three genes (ii) Multiple alleles
(3) A single gene exhibits multiple phenotypic expression (iii) Polygenic inheritance

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Important Questions on Heredity and Variation

MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
Define polygenic inheritance.
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
What will be number of gene pairs controlling a single character in polygenic inheritance if the phenotypic ratio obtained in F2 generation is 1 : 6 : 15 : 20 : 15 : 6 : 1?
HARD
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

Human height is a multigenic character. If the heights of all the individuals living in a metropolis are measured and the percentages of the population belonging to a specific heat are plotted as shown below, which of the plots would represent the most realistic distribution?
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MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
The phenotype of one parent for skin colour is AABBCC and other parent is aabbcc. What will be the skin colour and genotype for their progeny?
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

Match the following 

   List - I     List - II
(a) Holandric genes (i) Pleiotropy
(b) Multiple effects of a single gene (ii) Hypertrichosis
(c) Skin colour in man (iii) Multiple Alleles
(d) ABO Blood types (iv) Polygenic inheritance

The correct answer is

HARD
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
Explain Polygenic inheritance with example.
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
The gene that controls many characters is called
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
Multiple alleles are present:
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
If one gene influences many phenotypic traits, the phenomenon is called
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
Choose the possible genotypes responsible for lightest skin colour in human beings.
MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
Match the terms in Column-I with their description in Column-II and choose the correct option:
 
Column – I Column – II
(a) Dominance (i) Many genes govern a single character
(b) Codominance (ii) In a heterozygous organism, only one allele expresses itself
(c) Pleiotropy (iii) In a heterozygous organism, both alleles express themselves fully
(d) Polygenic inheritance (iv) A single gene influences many characters
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

The best example for pleiotropy is:

EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
A gene showing codominance has
HARD
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

Example of polygenic inheritance is 

MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings?
MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F1 generation, pink flowers were obtained. When pink flowers were selfed, the F2 generation showed white, red and pink flowers. Choose the incorrect statement from the following.
MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
The genotypes of a Husband and Wife are IA IB and IAi .
Among the blood types of their children, how many different genotypes and phenotypes are possible?
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
One of the following is quantitative abnormality of polypeptide globin chain synthesis
HARD
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
In a mating between two mulattos, each heterozygous at all three gene loci for the skin colour, what is the chance their child will have very light skin?
MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
A pleiotropic gene